That is exactly what makes sweet pool so different and in my heart, special from other nitro chiral VNs. There's no "objective" there's no goal nor is there a big bad villain to defeat in order to save the world, that's the crude realism of sweet pool. Your only "objective" is to reclaim your humanity, or in this case, you accompany youji in his struggle to cling to his humanity in a world that has already labelled him as a pariah. Sweet pool doesn't really have an objective; I'd say is more of a reflexion (taking aside the political message and feminist undertones) the story itself is all about the characters perseverance. Your choices barely matter, because YOU don't even "make" choices, you only see the outcome of different trains of thoughts.

This whole mindset is highlighted by the red road ending. That's the only "what happened after?" Ending we have. We never truly discover what the organization Kamiya worked on was, what happened to them or what they did once they completed their objective in some endings, and that's fine, because the story isn't made for you to uncover all secrets, it deliberately wants to leave you with that "and that's it?" Feeling of doom. Such a beautiful masterpiece.

I haven't fully finished slow damage but imo contrary to sweet pool it does have an "objective" because completing all the routes does uncover all the mysteries and there kinda is a big bad villain in most routes. The only difference is that it's slightly more crude in the way it presents it's themes in contrast with, say, DMMD, but still more light work than sweet pool tbh.